I think the community especially LSPDFR (GTA 5) deserves vehicles to choose from like:
-More department based vehicles (Basically, packs that are based off real departments with their lighting setup, equipment, etc.)
-More Fire/EMS vehicles ( Chevy, GMC Ambulances)
-More unique patrol vehicles (e.g. Caprice, Durango, Expedition)
-Older vehicles (2000-2006 Impala, Tahoe, etc.)
As you would know GTA 4 offers more variety in terms of vehicles so hopefully we would see the same with GTA 5 in the future.